Richards helped the Super League-based overseas side to a 16-12 victory over England in the inaugural international origin game in 2011 and is hoping to help them win the trophy for a third straight year.
"They'll be nervous because all the pressure's on them to perform with the World Cup coming up," he said. "The pressure is off us in that sense. We can just come out and enjoy ourselves and put a good performance in."
If the Exiles are to extend their overall lead to 3-1, they will need to keep a tight rein on full-back Sam Tomkins but Richards admits stopping his Wigan team-mate is no easy task.
"They try to do it week in week out," he said. "I'll have to ask them how to do it.
"You can't just concentrate on one player. We've just got to get ourselves right and come together in a short week."
Richards fancies Tomkins to retain his Man of Steel title after his remarkable tryscoring feats so far this year but believes another Wigan and England player, second-rower Liam Farrell, is a worthy contender after successfully filling the boots of Gareth Hock.
"Faz has been phenomenal for us this year," said Richards, who was given the title in 2010.
"He's gone under the radar for the last couple of years but he's been one of our best players all season. Gaz is a great player but everyone was quietly confident in Faz because he does the business.
"He's so consistent for such a young player. You can always rely on Faz. He'd be a great shot for Man of Steel. Obviously Sam is having a great year as well and he's probably a shot as well."